钻井液与完井液2018，Vol.35Issue(2)：78-84,7.DOI:10.3969/j.issn.1001-5620.2018.02.013
狮202井区裂缝性地层堵漏技术
Techniques for Mud Loss Control in Drilling Fractured Formations in Shi-202 Well Zone
摘要
Abstract
Mud losses mainly took place in the upper part of the N1 and E32 formations in the Shi-202 well zone. The N1 formation is full of fractures and the E32 formation is a double-medium reservoir full of fractures and solution vugs. Low formation pressure bearing capacity, long open hole, multiple lose zones in the hole and coexistence of high pressure and low pressure in the same open hole section have made it difficult to deal with the mud losses. A flaky particle material, NTS, with high compressive strength and being able to roll over when going into mud loss channels, was introduced to drilling fluid to stop and control mud losses. Based on the rates of mud losses, three mud loss control slurries were formulated through laboratory experiment: 1) active mud+1.0％NT-DS+(2％-3％) NTS (fine)+(1％-3％) walnut shell (0.1-1 mm)+(1％-3％) SDL+(1％-3％) SQD-98. The total concentration of these additives was 12％-13％. 2) base mud+2％ NTS (fine)+3％ walnut shell (1-3 mm)+(3％-4％) walnut shell (0.5-1 mm)+1％NT-DS+3％SDL+3％ SQD-98. The total concentration of these additives was 15％-16％. 3) base mud+3％ NTS (medium : fine = 1:2)+(3％-5％) walnut shell (1-3 mm)+(3％-5％) walnut shell (0.5-1 mm)+(1％-2％) NT-DS+3％ SDL+5％ SQD-98. The total concentration of these additives was about 25％. Operational program for the use of these mud loss control slurries was also developed and tried on 4 wells in the Shi-202 well zone. Good results have been obtained using the mud loss control slurries and mud losses were 100％ under control. Pressure bearing capacity of the targeted formation was enhanced, widening the safe drilling window of the formation. The success of the mud loss control has satisfied the requirements of subsequent operations.关键词
井漏/裂缝性地层/堵漏/井壁强化剂/狮202井区Key words
Mud loss/Fractured formation/Mud loss control/Borehole wall strengthening additive/Shi-202 well zone分类
能源科技引用本文复制引用
屈璠,韦西海,吴金星,刘顽,薛成,杨海琳..狮202井区裂缝性地层堵漏技术[J].钻井液与完井液,2018,35(2):78-84,7.基金项目
中国石油集团西部钻探工程有限公司科研项目"狮 202 井区防漏堵漏技术研究"(L130-16B20165.01). （L130-16B20165.01）
